Bumps [html-minifier](https://github.com/kangax/html-minifier) from 3.5.15 to 4.0.0.
- [Release notes](https://github.com/kangax/html-minifier/releases)
- [Commits](https://github.com/kangax/html-minifier/compare/v3.5.15...v4.0.0)
Signed-off-by: dependabot[bot] <support@dependabot.com>